Ex vivo binding specificity of FMSN-PEG-UEA1. Harvested AOM/DSS mouse polyp/tumor specimens incubated with FMSN-PEG (a, d and g) and FMSN-UEA1 (b, e and h). 50 µg mL−1 FITC-UEA1 was used as a positive control for staining (c, f and i). Fluorescence channels: FITC (a–c, green), DAPI (d–f, blue) and merge (g–i). Scale bar 50 µm.